Electric furnace.



L www Srs-regenerate @mm 'wenn Assas. ALEXIS ennwannaxnt. Renens citroenen, .aan c'rfro stramien-n,

or LcnvrKa, ewnnEN.

To all whom' 'it mag/:concern: elle `it `lnric'vvn fthat'we, EUGEN Assas Lexis -GRNWALL, ArranV RUnoLF fLINDeLAn, 'and "Omo fS'rLHaNE,\-engineers`, nsuh'ects of the King of Sweden', residing rat Lu Vitra, in the Kingdom offSweden', have invented certain new and usefulA lmrovements inv Electrici The present' vention 'relates to an' electric- 'furnace "for the reduction. of Vvmetals,

effollowing :is aspect y' `especially iron:y from` their ores, and it lchaeiy consists 1n giving "the furnace a yform Which-isv especially suitable for thepurpose whereby considerable advantages are gained over `hitherto Eknown* constructions. Y

In order to illustrate' the invention there `is shown in the accompanying drawing as an'examp'le a'furnace intended for the reduction of iron ore yand vconstructed in aecordanee with thisl lnvention.

Figure 1 shows the Vfurnace .in vertical section along the line A-B in Fig. 2 which is a horizontal progection of the smelting vchamber.

ik.. may not press on the cupola 6 covering the smelting chamber.

The `lowest part ofthe' shaft hasyas can be seen fromthe drawing, a smallerinterior diameter y'thanv either the smelting chamber or the hioher part of the pipe or shaft. The fact that the furnace, above, the smelting chamber, has a contractedl part from which the smelting ehain- .ber expands 'downward and the .shatter- .pandsvupward, and that the electrodes are arranged in such a Way thattheycome into Contact. with the charge :below this con- 'tractcd part, eonstitutesjust thev characteristie feature of the present invention. The cupola 6 should be for-med `or curved in such Way that between the Walls of said cupola and the charge which is sinking downthrou'gh 'the shaft, there shall always be one .or several free spaces. JThe electrodes. .2 should he so placed that they 'enter into they charge at'plaeeswvhere such free spaces exist; By this arrangementy attained that no considerable degree oiheat Willi'be 'developed inthe .immediateneighborhood of ter materia l ELECTRIC remmen.

v Specification of Letters Patient. Application illeel'uly 28, 1909*, erial Nail-59,989.

' rasantes nee. ia, 'recoil orded the greatest protection possible troni fthexiheetrj 'l he difficulty which always ex-` y ists 11i the cse of electric furnaces, viz. that of fleeing able to place the snielting zone -prolliier at a snilieient distance from the-brick- Wor 'is thus sol-.ved in a simple Way by this construction of .the furnace.

e lfthe .furnace shaft were lnot constriieted Iwith the .above `mentioned lcontracted. part the" material contained in the shaft would press so heavy on the `material contained inv the smeltin would 'be `pressed up into the free/ spaces above referred to. By'giving the ylower part of the shaft the'abcve stated contracted form, however, ythe'niaterial con* tained in the shaft will be .in some degree4 l the=hrickvvork, wherebythelatter Willhe afi I chamber `that a part of this ylatsupportedjby the Walls of said part of the f shatt'so that it does not pressso heavily `on the material contained in. the Sme ting, chamber that this latter material will-be pressed up into the said free spaces and thus the existence of said free s aces is secured' even when'the shaft is o a considerahle'so height# .a In the 'reduction of ore, especially' ironj ore, it is `ol importance vthat `the reducing i power ofthe gases produced inthe fornace` is nsedto as great a .degree as poible. In(

order to obtain this' result.,4 thecre mustbbji exposed to the action of the gas :for a 'siij eiently long timeA andl this 1s attained by Y -ln case it is considered necessary' the cnf* pola 6 can easily be cooled by the gas which yishtaken out from the throat bein presseiif in by means of a fan 8 or some ot ersuit able device through twyers` into thejr space or spaces between the=cupola-anol charge. This cooling is gained 'ivithatant"` orrespondinglosscf hcat,`fer theheat Which- A the gases take up from the cupola and the! giving the shaft or ,pipwsacient-ly gteaitf"4 l volume., y-'l,`his condition too "isf fnllled hylco,

charge is given haclagain tothe charge hi herpp in the pipe. i i

aving thus described oer invention," declare thatwhat We claim 1s:-

and passing such gas into -said free space portion of the furnace. ,l n 2. The combination in an' electric furnace with the heating 'chamber and the stack communicating therewith, the chamber -being organized to -providea free space between the charge andI the top of the heating chamber when the charge is introduced into the chamber and into the lower portion of the-stack, the electrodes arranged to enter through the top Wall of the heating chamber and extended down 'into the heating chamber to pass through the said free space with. their lower4 ends immersed'in the char e, and means for introducing gas into said eespace portion of the furnace. A

3. Electric Vblast furnace consisting of an electric smelting chamber provided with electrodes and a' shaft arranged on the said chamber and communicating with the same,

the shaft beingJ formed toexpandupward.

and-the smelting chamber to expand downl ward from the part through which said chamber and the shaft communicate with each other, theinterior of the 'smelting chamberbeing so formed, that. one or several free spaces always exist between the 'Walls of said chamber and trodes being arranged in suchaway thatr the charge and the electhey enter into the lcharge atl said lfree spaces, the furnace being also provided with means for' introducing suitable gases into thev said free s aces.

4;.' Electric b ast furnace consisting of an electrodes and a shaft arranged on the'said chamber-and'communicating with the same, the shaft being formed to expand upward .electric smelting chamber, provided with and-the smelting chamber. to expand downward from the part through which saidv v chamber 'and the shaft communicate with each other, the interior of the smelting chain-` ber being so formed, that one or several free spaces always exist between, the Walls of said chamber and the charge and the electrodes being arranged in 'such a way that theyenter into the charge at said free spaces, the furnace being also provided with means vfor introducing suitable gasesinto the said free spaces, the shaft being provided with means for leading oif1 the gases and for reintroduc ing them into said free spaces. i' 'A In witness whereof wehaveh'ereunto ,set our hands in presence of witnesses. vil.

EUGEN SSAR ALEXIS'GRNWALL.

AXEL RUDOLF LINDBLAD. erro srltairr.

Witnesses to the'signatures of E. A. A..

' LF.V Sonurirznnne,

T. BERGMAN.

hane:

, WiLLrAM Hansson, ANNA CARLANDERE.

Grnwall and A. R.L1ndblad: 'i 

